Machine fok sawing beveled curves



`UNITED sTATEs PATENT oEEIoE.

JONATHAN GREAGER, OF CINCINNATI, OHIO.

MACHINE FOR SAWING BEVELED CURVES.

Specification of Letters Patent No. 25,809, dated October 18, 1859.

To all Iwho/m it may concern:

Be it known that I, JONATHAN CREAGER, of Cincinnati, in the county of Hamilton and State of Ohio, have invented an Improved Machine for Sawing Curved Chair- Backs and Analogous Forms; and I hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, making part of this specification.

The subject of this invention is a machine for the rapid, accurate, and varied manufacture of the curved tops and slats of chairs, and analogous forms of cylindrical segments.

In the accompanying drawings, Figure l is a perspective view. Fig. 2 is a front elevation of a portion of the machine.

A. frame A supports, at or near its center, a power driven vertical shaft B, armed with an .inverted crown saw formed of plates C, secured to a cylindrical hub D by bands E, dowels F, and screws Gr or other suitable means. The advancing edges of the segments incline obliquely toward the back of the blade from the cutting edge, so as to form therewith an obtuse angle and thereby stiften the blade and reduce the liability to catch in the kerf.

For the manufacture of slats having edges of unequal thickness, I employ a rest supported on fulcra I, adjustable in height and having adjustable stops J J to support alternately the front and back edges of the rest as these parts are severally depressed by the operator. The same rest fixed in either position is employed for the manufacture of slats of simple cylindrical form. K is an end stop on the rest, and L are adj ustable back stops or gages against which the back of the bolt is set by the operator. The stops L are set at a dist-ance to the rear of the concave surface of the saw equal to the desired thickness of the article to be produced. M are springs whichT pressing against the back of the bolt, hold the piece until completely separated and then guide it onto the discharging chute N. The front edge of the rocking rest H has a catch O P, by which that edge is retained in a depressed position. It will be seen that such a provision is not required at the rear edge of the rest, because the stress of the saw, and usually the weight of the stuff also, tend to hold the rear edge down. Q are check pieces to arrest the rotary motion of the separated piece and cause it to drop onto the chute N.

For the purpose of sawing crowning slats and tops, I employ a restconstructed as follows: R is a bench or table adapted to be set at any Obliquity to the aXis of the saw. This bench is provided with back stops Z and springs m similar to those used with that already described. It may however have for some uses adjustable front gages or knees P P; but for most purposes the gages within the concavity of the saw are preferred, because they render unnecessary any device fo-r the special adjustment of the bolt, and consequently, while simpler in construction, enable a much more rapid feeding of the bolt.

S T are friction pulleys, kept in motion from the driving power and which, being at the will of the sawyer made to hug the shank U of the rest, effect its elevation.

The catch O P may be made self releasing by the upward motion of the rest or may be placed by an eccentric clamp or other device.

The rest H may be rocked by a simple arrangement of a pair of wedges afliXed transversely to a lever beneath the rest and under control of the operator.

The inclination of the rest- R may be a descending one toward the saw so that the gravity of the stuff may assist its feeding.

I claim as new and of my invention herein and desire to secure by Let-ters Patentl. The combination of the inclined rest R with a crown saw for the production of a crowning cylindrical segment.

2. The combination of the rocking rest H with a crown saw for the manufacture of a cylindrical segment having oblique axes.

In testimony of which invention, I hereunto set my hand.

JONATHAN CREAGER.

Witnesses:

GEO. H. KNIGHT, C. STEEMER, Jr. 

